Calipers



(No Model.)

0. D WARFIELD.

GALIPERS. N0. 364,067. Patented May 31,1887;

WITNESSES INVENTOR: 6). mm? M 2 &5 3Y

ATTORNEYS.

UNITED ST TES A PATENT OFFI E.

OLIVER- D. WARFIELD, oFoHIooPEE FALLS, MASSACHUSETTS.

CALIPERS.

SPECIFICATION forming partof Letters Patent No. 364,067, dated May 31, 1887.

Application filed February 28, 1887. Serial No. 229,131. (so model) To all whom it 11mg concern:-

Be it known that I, OLIVER D. WARFIELD, of Ohicopee Falls, in the county of Hampden and State of Massachusetts, have invented new.

' Fig. 3 is adetail perspective view ofthe spring.

Similar letters ofreference indicate corresponding parts in all the views.

The object of my invention isto' provide calipers without pivotal joints.

My invention consists in a joint for calipers and other similar tools, formed of two rolling surfaces held together by a spring, as hereinaftermore fully described.

The legs A'B of the calipers are provided at their pivotal ends with cylindrical convex surfaces a, adapted to roll upon each other as the calipers are opened or closed; and in the outer side of each leg of the calipers is formed a mortise, I), for receiving the'ends of a circular Spring, 0, provided with tenons c, fitted to the mortises b. In the leg A is loosely pivoted a threaded rod, D,which extends through a sleeve, d, pivoted in the mortise in the leg B, the said rod D being provided with a milled nut, E, which may be turned upon the rod for the purpose of adjustiugthe calipers.

My improvement may be applied to dividers and similar tools.

Fig. 2 is a In Fig. 2 I have shown a modification in which the convex surfaces to are provided with teeth or serrations upon their contact-faces.

surfaces in contact.

2. In calipers and-similar tools,the combination of the legs A. B, provided with convex surfaces a and mortises b, and the spring 0,

provided with tenons c, fitted to the mortises, substantially as described.

3. As an improved article of manufacture, calipers formed of the legs A B, provided with the convex Surfaces a and mortises b, the spring 0, having tenons c fitted to the mortises b, the threaded rod D, pivoted in one leg of the calipers, the sleeve d, pivoted in the other leg,

and the adjusting-nut E, substantially as described.

OLIVER D. WARFIELD.

Witnesses:

FRANK EUGEN HOBART, J. NAPOLEON LAMOUREUX. 

